Improved process op treating paper stock to make pulp



gotten giants germ ffirr.

JOEL TIFFANY, OF- ALBANY, NEW YORK.

' Letlcrs Patent No. 67,229, dated July so, 1867.

flit: Srlgrhule 'nferreh. it in time 3mm noun ant limiting part at the ram.

TO WHOM ITMAY CONCERN:

Be it known that I, JpEL TXFFANY, of the city and county of Albany, and Stute of New York, have invented a new andimprovcd Process of Treating Paper Stock preparatory to pulping the same; and I lie-hereby declare that the following is a full and-exact description of the same. i i I The nature of my improvement consists in my method of applying the cuustic liquor to the-stock being treated. i

4 My stock is first cut into short lengths or otherwise broken up, mashed, crushed, or ground, is soul-red or steamed, as may be desired, is packed into my'boiler, when my improved process commences. I hnve my boiling liquor prepared in a, separate closed vessel capable of sustaining a high internai pressure with safety. I beat such liquor to as high a. degree of temperature as is ever desirable to do during the process of boiling, and keep it in that heated state. I, having charged my boiler with the amount of stock to be nested-close the some air and steam-tight.- I then proceed to exhaust the air therefromby any of the well-known processes of exhausting air from vessels, and when this is sudiciently dono -I then open-u stop-cock connecting my boiler with the vessel in which my boiling liquor is ready prepared and highly l|ente(l,-n%-u-b0ve set forth, and the hot liquor rushes in to supply the vacuum caused by the exhaustion of the air-,filling all thepores and cells of the stock with a. highly heuted and intensely efl'ective liquor, the result of which is that every part of the stock is acted upon simultaneously and uniformly, and the time required toeomplete the-reduction of the-stock is largelyreduced, producing an improved fibrous pulp, saving likewise a large per cent; of the stock destroyed by the ordinary methods of treating the some. Immediately after running into the boiler, the boiling liquor, as above described, the pressure within the boiler may be speedily increased to any desirable amount by the use of an atmospheric or pneumatic pressure, applied by means of a forcing-pump. This may sometimes be desirable, according to the close or refrnctorynature oi'the stock being treated. If a pressure higiiefrthan one hundred and ten pounds to the inch is found desirable, the additional pressure should be obtained pneumatic means, as a heat much higher than that indicated by one hundred and ten pounds tends-to injure the-quulityvof the fibre;

Having thus described themeture of my invention; I will pro'ceedto set forth my cliiimsl' I do not claim the mode of preparing the stock by previously soaking or steaming the some before boiling, nor do I claim the use of means to produce un air-vacuum in the boiler after the same is charged with the stock, r the use of pneumatic pressure in the treatment of the same. But what I do claim us my inventionyand desire to secure by Letters Patent, is- I l I The introduction and use of a highly heated boiling liquor into the stock enclosed in a close boiler immediately after the air has been exhausted therefrom, in combination with the vacuum produced within the boiler by such exhaustion of the air, substantially in the manner and for the purpose above described.

I also claim the sbove process in combination with the use of atmos pheric urpneumntic pressure. ub' t tislly in the manner and forthe purpose above described.

JOEL TIFFANY."

Witnesses:

J'ossru Becsuy, Cans. L. Coonns. 

